Preparation of Ta-Doped TiO2 Using Ta2O5 as the Doping Source
XU Cheng1**, LIN Di1, NIU Ji-Nan1, QIANG Ying-Huai1, LI Da-Wei2, TAO Chun-Xian3
1School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116 2Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800 3Shanghai Key Laboratory of Modern Optics System, School of Optics-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093
Abstract：A novel method for preparing Ta-doped TiO2 via using Ta2O5 as the doping source is proposed. The preparation process combines the hydrothermal fluorination of Ta2O5 and the subsequent formation of Ta-doped TiO2 sol. The results show that the doped sample annealed at 393 K generates an unstable intermediate NH4TiOF3, which converts into anatase TiO2 with the increase of temperature. After annealing at ≥673 K, the Ta-doped TiO2 nanocrystals with the grain size <20 nm are obtained. Both the XRD and TG-DSC results confirm that Ta doping prevents the anatase-rutile crystal transition of TiO2. The band gap values of the doped samples, as obtained by UV-vis diffuse reflectance spectra, are smaller than that of pure anatase TiO2. The first-principle pseudopotential method calculations indicate that Ta5+ lies in the TiO2 lattice at the interstitial position.
. [J]. 中国物理快报, 2015, 32(08): 88102-088102.
XU Cheng, LIN Di, NIU Ji-Nan, QIANG Ying-Huai, LI Da-Wei, TAO Chun-Xian. Preparation of Ta-Doped TiO2 Using Ta2O5 as the Doping Source. Chin. Phys. Lett., 2015, 32(08): 88102-088102.
2015, Vol. 32 
